How to Calculate Funding Fees on Perpetual Futures (With Examples)

Funding fees look tiny on a single settlement — often a few dollars on a mid-sized position — but across a multi-day or multi-week hold they add up in ways that are easy to underestimate. This guide shows exactly how to calculate them by hand, with worked examples for both long and short positions, before pointing to a free calculator that does the arithmetic instantly.

Direct answer: A funding fee is calculated as notional position value × funding rate, charged once per settlement interval (commonly every 8 hours). A long position pays when the rate is positive and receives when it's negative; a short position does the opposite. Multiply the per-interval amount by the number of settlements held through to get the total cost or credit.

Educational content only. This article and the linked calculator require every number to be entered manually — nothing here connects to an exchange or trading account.

The Core Formula

Funding per interval = Notional value × Funding rate

Where notional value is your position size expressed in the quote currency (for a coin position, quantity × entry price), and the funding rate is the rate quoted for a single interval — which can be positive or negative depending on market conditions.

To find the total across a hold, multiply by the number of settlements:

Total funding = Notional × Rate × Number of intervals

The sign of the result depends entirely on your side: a long position pays when the rate is positive and receives when it's negative; a short position does the reverse.

Worked Example 1 — Long Position, Positive Rate

• Side: Long
• Notional: $10,000
• Rate: 0.01% every 8 hours
• Hold: 1 day (3 settlements)

Per settlement: 10,000 × 0.0001 = $1.00. Over 3 settlements: −$3.00 — a cost, because the position is long and the rate is positive.

Worked Example 2 — Short Position, Same Rate

Identical numbers, but the position is short instead. The direction flips: the trader receives funding, +$3.00 over the same day, because shorts are paid when longs pay.

Worked Example 3 — Higher Settlement Frequency

• Notional: $5,000, rate: 0.01% every 1 hour, hold: 12 hours → 12 settlements.
• Per settlement: 5,000 × 0.0001 = $0.50. Total across the hold: $6.00.

Shorter intervals mean more settlements over the same clock time, so an identical per-interval rate accrues faster on a 1-hour schedule than on an 8-hour one — a detail that's easy to overlook when comparing rates quoted for different exchanges with different settlement frequencies.

Worked Example 4 — A Multi-Day Hold

• Notional: $25,000, rate: 0.015% every 8 hours (a typical mid-range rate), hold: 7 days → 21 settlements.
• Per settlement: 25,000 × 0.00015 = $3.75. Total across the week: $78.75.

This example is the one that surprises most traders — a rate that looks negligible per settlement compounds into a real cost over a week-long hold, especially on larger notional positions. It's a cost that's easy to miss if you're only checking the account balance rather than reconciling funding payments against your entries.

Annualizing the Rate for Comparison

To compare funding costs meaningfully across different rates and settlement intervals, annualize the number:

APR ≈ Rate × number of intervals per year

An 8-hour rate of 0.01% has 1,095 settlements per year (365 × 3), so: 0.01% × 1,095 ≈ 10.95% annualized. Framing funding as an annualized percentage — rather than a small per-interval fraction — makes it much easier to judge whether it's a meaningful cost relative to the position's expected return, and is the same framing traders use to compare funding costs across different exchanges and pairs.

Where People Get the Math Wrong

The two most common calculation errors are: forgetting to multiply by the number of settlements over the actual hold period (using a single interval's rate as if it were the total), and mixing up the sign convention for long versus short — both of which the worked examples above are designed to make explicit.

Let the Calculator Do It

Rather than reaching for a spreadsheet every time, use the free Funding Fee Calculator. Choose your side, enter size (in USD, or as quantity × entry price), the rate, your settlement interval, and how long you plan to hold — it returns the per-funding amount, the total, the effective percentage, and the annualized APR instantly. Logged-in users can add the result directly to their manually tracked bankroll as a recorded trade. For background on what funding rates represent and who pays whom, see What Are Crypto Funding Fees?, or browse the tools index for other free, manual-entry calculators.

Key Takeaways

• Funding = notional × rate × number of intervals held through.
• A long pays on a positive rate; a short receives on a positive rate — and vice versa for negative rates.
• Shorter settlement intervals accrue funding faster for the same per-interval rate; annualize to compare fairly across exchanges.
• Skip the manual spreadsheet — use the Funding Fee Calculator to run any scenario in seconds.

FAQ

How often are funding fees charged? Most major exchanges settle funding every 8 hours, though some venues use 4-hour or even 1-hour intervals for certain pairs. Check the specific exchange's contract specifications, since the interval directly changes how fast funding accrues.

Do I pay funding fees even if my position doesn't move in price? Yes. Funding is charged based on the funding rate and your position's notional value, independent of whether the underlying price moved — it's a payment between long and short traders, not a trading profit or loss on price movement itself.

Can funding fees exceed my trading profit? Yes, particularly on a leveraged position held for an extended period during a stretch of consistently high funding rates in one direction — this is why annualizing the rate before entering a long hold is a useful habit.

Is a negative funding rate good or bad for me? It depends on your side. A negative rate means shorts pay longs, so a long position receives funding while a short position pays it — the opposite of a positive-rate environment.

How do I enter numbers into the funding fee calculator? Every input — side, size, rate, interval, and hold time — is typed in by hand. The calculator runs on the numbers you enter.

Why does the same rate cost more on a 1-hour interval than an 8-hour one? Because there are more settlements over the same amount of clock time — 24 settlements per day on a 1-hour schedule versus 3 on an 8-hour schedule — so the identical per-interval rate compounds through more payments.